body,
html {
    height: 100%
}

body {
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-container {
    width: 600px;
    height: 600px;
    background-image: radial-gradient(#191919 20%, #666666 65%, #ffffff);
    border-radius: 50%;
}